I try the Birt 2.3.1RC1 (I need this version) and I use XML data source.

When I defnie my datasource by the standard way : in the "XML DataSource
Connection Properties" (I give the xml file in the first field)

my report work perfectly.

but when I try to use the "Properties Binding" (I filled the first field)
I have an error "Some connection properties are missing." (even if I dont
use report parameters (I wan't to use parameters for switch XML), and I
only give the URL of the XML file)